X-Git-Url: http://gitweb.michael.orlitzky.com/?a=blobdiff_plain;f=mjo-listing.tex;h=bcfe25f4af5673bfbcd9bf6ab58094fae5343f6a;hb=a331ae0b381e9b3a0fa68d3ef42e7fac42dbb471;hp=5207aa2b83e1721af9ca8378ab72ca8c6a5ae877;hpb=ff61d05732bb49a62b91f6b32ba1e2cdb6d82d19;p=mjotex.git

diff --git a/mjo-listing.tex b/mjo-listing.tex
index 5207aa2..bcfe25f 100644
--- a/mjo-listing.tex
+++ b/mjo-listing.tex
@@ -10,8 +10,17 @@
 %   x
 %   \end{tcblisting}
 %
-\usepackage{listings}
-\usepackage{tcolorbox}
+\ifx\havemjolisting\undefined
+\def\havemjolisting{1}
+
+
+\ifx\lstset\undefined
+  \usepackage{listings}
+\fi
+
+\ifx\tcbuselibrary\undefined
+  \usepackage{tcolorbox}
+\fi
 
 % Tell tcolorbox to use ``listings'' within the boxes.
 \tcbuselibrary{listings}
@@ -38,3 +47,22 @@
   keywordstyle=\color{brilliantlavender},
   stringstyle=\color{brilliantgreen}
 }
+
+
+% Input a SageMath example code listing from a file. You generally
+% want these to be in separate files so that the build system can test
+% them automatically.
+%
+% The sole argument is the "name" of the listing, which ultimately
+% just identifies a file named "sage_listings/<name>.listing".
+\newcommand*{\sagelisting}[1]{\tcbinputlisting{listing only,%
+               colback=codebg,%
+               coltext=codefg,%
+               enlarge bottom finally by=\baselineskip,%
+               enlarge top initially by=\baselineskip,%
+               left=2em,%
+               listing options={language=sage,style=sage},%
+               listing file=sage_listings/#1.listing}}
+
+
+\fi